66922-25-6 Butanoic acid, 2-methyl-, 7-(acetyloxy)-2,3,3a,4,7,8,9,11a-octahydro-9-hydroxy-10-(hydroxymethyl)-6-methyl-3-methylene-2-oxocyclodeca[b]furan-4-yl ester EUPACURVIN Eurecurvin NSC292663